The Wacky Adventures of Ronald McDonald: The Monster O'McDonaldland Loch is the sixth of six specials released in January 28, 2003 based on the McDonald's fast food restaurant's own Ronald McDonald and gang.
Starring
- Ronald McDonald as Himself
- Charlie Adler - Hamburglar, McNugget#3, Car
- Dee Bradley Baker - Sundae
- Christine Cavanaugh - Birdie
- Lisa Raggio - McNugget#2
- Kevin M. Richardson - Grimace
- Pamela Segall-Adlon - McNugget#1
Also Starring
- Euan MacDonald - Simon the Monster
- James K. Ward - Scotty
- Kim Mai Guest - Kids
- Mona Marshall - Kids
- Drew Massey - Pip
- Phil Snyder - Stiles
- Tara Strong - Girl, Boy, Sheep
- Julian West - Dad, Officer
- Jim Cummings - Announcer